处于半开启状态，因节流口的存在，P油口还保持一定的压力。2、在滑阀移动到中位的瞬间使P、A、B与T油口半开启的接通，这样可以避免在换向过程中由于压力油口P突然封堵而引起的换向冲击。3油泵不能卸荷。4、换向性能介于0型和H型之间。 七、U型符号为 结构特点：A、B工作油口接通，进油口P
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